/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.gateway.plugin.ratelimiter.algorithm;


import com.gateway.common.enums.RateLimitEnum;
import com.google.common.collect.Maps;

import java.util.Map;

/**
 * The type Rate limiter algorithm factory.
 */
public final class RateLimiterAlgorithmFactory {

    private final static Map<String, RateLimiterAlgorithm<?>> ALGORITHM_MAP;

    static {
        ALGORITHM_MAP = Maps.newConcurrentMap();
        ALGORITHM_MAP.put(RateLimitEnum.CONCURRENT.getKeyName(), new ConcurrentRateLimiterAlgorithm());
        ALGORITHM_MAP.put(RateLimitEnum.LEAKY_BUCKET.getKeyName(), new LeakyBucketRateLimiterAlgorithm());
        ALGORITHM_MAP.put(RateLimitEnum.SLIDING_WINDOW.getKeyName(), new SlidingWindowRateLimiterAlgorithm());
        ALGORITHM_MAP.put(RateLimitEnum.TOKEN_BUCKET.getKeyName(), new TokenBucketRateLimiterAlgorithm());
    }
    
    private RateLimiterAlgorithmFactory() {
    }
    
    /**
     * New instance rate limiter algorithm.
     *
     * @param name the name
     * @return the rate limiter algorithm
     */
    public static RateLimiterAlgorithm<?> newInstance(final String name) {
        return ALGORITHM_MAP.getOrDefault(name, new TokenBucketRateLimiterAlgorithm());
    }
}
